Abstract

Magnetic domain walls moving in ferromagnetic materials are easily pinned by defects and residual stresses. The mechanisms through which this happens are of both practical and theoretical interest. In this presentation, a model is presented and used to explore the interaction of magnetic waves and elastic waves in a ferromagnetic material containing defects. We consider the vibration of piecewise homogeneous ferromagnetic space with a crack. The crack is located at the interface between two half-spaces whose magneto-elastic variables have different values. The space vibrates under the action of a harmonic force of mechanical origin applied to the surface of the crack. The space is in an external homogeneous magnetic field, the direction of which coincides with directions of the initial magnetization vector and the external mechanical force. The problem is reduced to the solution of a system of singular integral equations. We determine numerically the stresses, strains and magnetization vectors of the piecewise-homogeneous ferromagnetic space. The mentioned field parameters have strong singularities around crack tips and essentially depend on vibration frequency, crack length, and the properties of the ferromagnetic material.

 

Biography

Satenik Harutyunyan received her B.S in Mechanical Engineering and Applied Mathematics from Yerevan State University in 1995 and M.S in Materials Science and Engineering from Virginia Tech in 2006. As a Research Assistant, she worked on Plasticity and Strengthening Problems of Cylindrical and Conical Tubes at the Institute of Mechanics. She is currently working on her PhD Degree in Materials Science and Engineering at Virginia Tech and is advised by Dr. William Reynolds. Her dissertation work focuses on Magnon-Phonon Interactions in a Cracked Ferromagnetic Structures.